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W. E. SARTWELL. Picker Staff Check.

Patented Oct. 19, 1880.

N. Pm PHOTQ-LITHOGRAPHER. WASH IINITE' rATEs PATENT Erica.

WILLIAM E. SARTWELL, OF LOWELL, MASS, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO JOHN W. CURRIER, OF NORTH TROY, N. Y.

PlCKER-STAFF CHECK.

SPECIFICATION forming part of Letters Patent No. 233,555, dated October 19, 1880.

Application filed April 28, 1879.

To all whom it may concern:

Be it known that I, WILLIAM E. SARTWELL, of Lowell, county of Middlesex, and State of Massachusetts, have invented a new and useful Improvement in Picker-Staff Checks, of which the following is a specification.

The invention relates to checks for pickerstaffs of looms.

The object of my invention is to provide a picker-staff check that shall operate to check the picker-staffin its backward movement with a resistance increasing as it approaches the head-block, and by a mechanism which can be adjusted so as to give any desired rate of increase, one which may be gradual and regular during a part of the movement, and afterward suddenly and greatly increased; also, to provide a mechanism which shall be cheap and easily applied to looms in use without in any way altering them.

My invention consists in the arrangement and combination of a spring-bolt, cam, and rock-shaft provided with an arm, and in a device for adjusting these several parts in an expeditious and effective manner.

In the accompanying drawings, in which similar letters of reference indicate like parts, Figure 1 is a side elevation of a shuttle-box with my improved picker-staff check attached. Fig. 2 is a plan view from below. Fig. 3 is a side View of the rock-shaft with cam broken away to show its construction.

A is a portion of the lay of a loom which forms one side of the shuttle-box. B is the slot in which the picker-staff moves. 0 is the bolt actuated by the spiral spring 0, the tension of which is changed by moving the collar 6, which is held at any point desired by the set-screw f. G is the cam attached to the rock-shaft 'i, on which shaft is formed the crank-arm h, with which the picker-staifcomes in contact in its backward movement.

M is the frame, having lugs m m, in which the spring-bolt 0 moves, and the lug a, which serves as a stop for the cam G. This frame is attached to the shuttle-box by common wood-screws, as also is the box N, which carries the rock-shaft and attached parts. The frame M is attached to the shuttle-box in an inclined position, bringing the bolt, when fully projected, against the cam, very near the rockshaft, in order that the resistance the pickerstaff meets when it first comes in contact with the crank-arm It shall be very little; but as the crank-arm is moved backward the point 5 of the bolt bears farther and farther from the shaft and a spring exerts a greater force to check the staff. This force increases gradually through the third quarter of the backward movement of the pickerstaif and rapidly through the last, reaching its maximum just before the staff reaches the head-block.

The cam is attached to and made adjustable upon the rock-shaft by cutting a thread on the shaft and in the cam, and screwing the cam upon it, and afterward, when in proper posi tion, screwing a nut upon the shaft to act as a jam-nut.

Whenever it is desired to make the check act on the picker-staff through a greater or less part of its arc of motion it is only necessary to start up the jam-nut and move the crank-arm in the direction desired, and then screw down the jam-nut, confining the cam and rock-shaft in their new position. It is obvious that this adjustment can be made quicker and better than if keys or set-screws are used, while by it the construction of any square part, shoulder-slot, or other device to resist the shocks of use is avoided, while the construction of the machine is greatly cheapened, simplified, and rendered susceptible of more accurate adjustment than by any known available device.

I am aware thatjam-nuts are not a new invention, and I do not claim them, broadly.

It will be observed that by the construction herein described the picker-staff is not jarred by being suddenly brought in contact with the full resisting force of a spring, but meets c the checking force gradually.

What I claim as new and of my invention 1s 1. The combination of the rock-shaft t, cam G, crank h, spring-bolt O, and bearing and 5 supporting devices adapted to be secured to the lay of a loom, substantially as and for the purpose set forth.

2. A picker-staff check composed of the rock-shaft i, arm h, and cam G, in combination with spring-bolt O and supporting devices adapted to be secured to the lay of a loom, the said arm it being adapted to engage the picker-staff and turn the shaft 2', whereby the spring-bolt is caused to act upon the cam at different points at different times, substantially as specified.

3. The combination of the plate M, provided with the lugs m m n, the bolt G, provided with the adjustable collar 6, spiral spring a, bearing I N, and rock-shaft 43, provided with the cam G and crank h, substantially as described.

4. A shaft provided with a screw-threaded I 5 portion, in combination with a cam constructed as described, whereby it may be screwed upon the shaft, and a jam-nut to follow the cam and secure it in any desired position on the shaft, as and for the purpose set forth.

WILLIAM E. SARTWELL.

W'itnesses DAVID HALL RIcE, LEPINE 0. RICE. 

